fix: skip ShipIt PR creation on release commits to prevent loop (#46)

When a release PR was merged, the shipit-pr job would run again on the
release commit, see it as a new change, and create another release PR
— repeating indefinitely. Adding the inverse condition of the release
job prevents this cycle.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: dbrattli

.github/workflows/publish.yml

@@ -12,6 +12,7 @@ jobs:
   shipit-pr:
     name: ShipIt - Pull Request
     runs-on: ubuntu-latest
+    if: "!startsWith(github.event.head_commit.message, 'chore: release ')"
     timeout-minutes: 10
     steps:
       - name: Checkout code